<template>
  <div>
    <el-switch
      v-model="draggable"
      active-text="开启拖拽"
      inactive-text="关闭拖拽"
    ></el-switch>
    <el-button v-if="draggable" @click="batchSave">批量保存</el-button>
    <el-button type="danger" @click="batchDelete">批量删除</el-button>
    <el-tree
      :data="menu"
      :props="defaultProps"
      :expand-on-click-node="false"
      node-key="catId"
      :default-expanded-keys="expandedKey"
      :draggable="draggable"
      :allow-drop="allowDrop"
      @node-drop="handleDrop"
      ref="menuTree"
    >
      <span class="custom-tree-node" slot-scope="{ node, data }">
        <span>{{ node.label }}</span>
        <span>
          <el-button
            v-if="node.level < 3"
            type="text"
            size="mini"
            @click="() => openAppend(data)"
          >
            添加
          </el-button>
          <el-button type="text" size="mini" @click="() => openEdit(node)">
            修改
          </el-button>
          <el-button
            v-if="node.childNodes.length == 0"
            type="text"
            size="mini"
            @click="() => remove(node, data)"
          >
            删除
          </el-button>
        </span>
      </span>
    </el-tree>
    <el-dialog :title="dialogTitle" :visible.sync="dialogFormVisible">
      <el-form :model="cateory">
        <el-form-item label="分类名">
          <el-input v-model="cateory.name" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="图标">
          <el-input v-model="cateory.icon" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="计量单位">
          <el-input v-model="cateory.productUnit" autocomplete="off"></el-input>
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogFormVisible = false">取 消</el-button>
        <el-button type="primary" @click="submintDialog">确 定</el-button>
      </div>
    </el-dialog>
  </div>
</template>

<script>
const defaulCateory = {
  catId: null,//分类id
  catLevel: 0,//层级
  name: "",
  icon: null,
  parentCid: 0,//父分类id
  productUnit: null,//计量单位
  showStatus: 1,
  sort: 0
}
export default {
  name: 'RenrenFastVueMasterCategory',
  data () {
    return {
      pCid: [],
      draggable: false,
      updateNodes: [],
      maxLevel: 0,
      dialogType: "", // 添加：add 修改：edit
      dialogTitle: "",
      cateory: {
        catId: null,// 分类id
        catLevel: 0,// 层级
        name: "",
        icon: null,
        parentCid: 0,// 父分类id
        productUnit: null,// 计量单位
        showStatus: 1,
        sort: 0
      },
      menu: [],
      dialogFormVisible: false,
      expandedKeys: [],// 要展开的菜单
      defaultProps: {
        children: 'child',//子节点放在了哪里
        label: 'name'       // 子节点名字叫什么
      }
    }
  },
  methods: {
    getCategory () {
      this.$http({
        url: this.$http.adornUrl('/product/category/list/tree'),
        method: 'get',
      }).then(({ data }) => {
        this.menu = data.page
      })
    },
    submintDialog () {
      if (this.dialogType == "add") {
        this.addCateory()
      } else if (this.dialogType == "edit") {
        this.editCateory()
      }
    },
    openAppend (node) {
      this.dialogType = "add"
      this.dialogTitle = "添加分类"
      this.dialogFormVisible = true
      this.cateory.catLevel = node.catLevel * 1 + 1 // 设置层级
      this.cateory.parentCid = node.catId           // 设置父节点id 为点添加按钮节点的id
    },
    openEdit (node) {
      this.dialogType = "edit"
      this.dialogTitle = "修改分类"
      // 发送请求回显数据，防止被人已经修改了，拿到脏数据
      this.$http({
        url: this.$http.adornUrl(`/product/category/info/${node.data.catId}`),
        method: 'get',
      }).then(({ data }) => {
        this.cateory = data.category
        this.dialogFormVisible = true
      })

    },
    addCateory () {
      let cateory = this.cateory
      this.$http({
        url: this.$http.adornUrl("/product/category/save"),
        method: 'post',
        data: this.$http.adornData(
          cateory
          , false),
      }).then(({ data }) => {
        //重新获取菜单
        this.getCategory()
        //设置需要展开的菜单
        this.expandedKeys = [this.cateory.parentCid]
        this.$message({
          message: '菜单添加成功',
          type: 'success'
        })
      })
      this.cateory.name = ""
      this.dialogFormVisible = false
    },
    editCateory () {
      let { catId, name, productUnit, icon } = this.cateory
      this.$http({
        url: this.$http.adornUrl("/product/category/update"),
        method: 'post',
        data: this.$http.adornData({ catId, name, productUnit, icon }, false),
      }).then(({ data }) => {
        // 先设置需要展开的菜单
        this.expandedKeys = [this.cateory.parentCid]
        // 清除cateory
        this.cateory = Object.assign({}, defaulCateory)
        this.dialogFormVisible = false
        //重新获取菜单
        this.getCategory()
        this.$message({
          message: '菜单修改成功',
          type: 'success'
        })
      })
    },
    remove (node, data) {
      this.$confirm(`删除【${data.name}】分类, 是否继续?`, '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        let ids = [data.catId]
        this.$http({
          url: this.$http.adornUrl("/product/category/delete"),
          method: 'post',
          data: this.$http.adornData(
            ids, false
          ),
        }).then(({ data }) => {
          //重新获取菜单
          this.getCategory()
          //设置需要展开的菜单，也就是刚刚删除的菜单的父id
          this.expandedKeys = [node.parent.data.catId]
          this.$message({
            message: '菜单删除成功',
            type: 'success'
          })
        })
      }).catch(() => {
      })
    },
    batchDelete () {
      let catIds = []
      let checkedNodes = this.$refs.menuTree.getCheckedNodes()
      console.log("被选中的元素", checkedNodes)
      for (let i = 0; i < checkedNodes.length; i++) {
        catIds.push(checkedNodes[i].catId)
      }
      this.$confirm(`是否批量删除【${catIds}】菜单?`, "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning"
      })
        .then(() => {
          this.$http({
            url: this.$http.adornUrl("/product/category/delete"),
            method: "post",
            data: this.$http.adornData(catIds, false)
          }).then(({ data }) => {
            this.$message({
              message: "菜单批量删除成功",
              type: "success"
            })
            this.getMenus()
          })
        })
        .catch(() => { })
    },
    batchSave () {
      this.$http({
        url: this.$http.adornUrl("/product/category/update/sort"),
        method: "post",
        data: this.$http.adornData(this.updateNodes, false)
      }).then(({ data }) => {
        this.$message({
          message: "菜单顺序等修改成功",
          type: "success"
        })
        //刷新出新的菜单
        this.getMenus()
        //设置需要默认展开的菜单
        this.expandedKey = this.pCid
        this.updateNodes = []
        this.maxLevel = 0
        // this.pCid = 0;
      })
    },
    handleDrop (draggingNode, dropNode, dropType, ev) {
      console.log("handleDrop: ", draggingNode, dropNode, dropType)
      //1、当前节点最新的父节点id
      let pCid = 0
      let siblings = null
      if (dropType == "before" || dropType == "after") {
        pCid =
          dropNode.parent.data.catId == undefined
            ? 0
            : dropNode.parent.data.catId
        siblings = dropNode.parent.childNodes
      } else {
        pCid = dropNode.data.catId
        siblings = dropNode.childNodes
      }
      this.pCid.push(pCid)

      //2、当前拖拽节点的最新顺序，
      for (let i = 0; i < siblings.length; i++) {
        if (siblings[i].data.catId == draggingNode.data.catId) {
          //如果遍历的是当前正在拖拽的节点
          let catLevel = draggingNode.level
          if (siblings[i].level != draggingNode.level) {
            //当前节点的层级发生变化
            catLevel = siblings[i].level
            //修改他子节点的层级
            this.updateChildNodeLevel(siblings[i])
          }
          this.updateNodes.push({
            catId: siblings[i].data.catId,
            sort: i,
            parentCid: pCid,
            catLevel: catLevel
          })
        } else {
          this.updateNodes.push({ catId: siblings[i].data.catId, sort: i })
        }
      }

      //3、当前拖拽节点的最新层级
      console.log("updateNodes", this.updateNodes)
    },
    updateChildNodeLevel (node) {
      if (node.childNodes.length > 0) {
        for (let i = 0; i < node.childNodes.length; i++) {
          var cNode = node.childNodes[i].data
          this.updateNodes.push({
            catId: cNode.catId,
            catLevel: node.childNodes[i].level
          })
          this.updateChildNodeLevel(node.childNodes[i])
        }
      }
    },
    allowDrop (draggingNode, dropNode, type) {
      //1、被拖动的当前节点以及所在的父节点总层数不能大于3

      //1）、被拖动的当前节点总层数
      console.log("allowDrop:", draggingNode, dropNode, type)
      //
      this.countNodeLevel(draggingNode)
      //当前正在拖动的节点+父节点所在的深度不大于3即可
      let deep = Math.abs(this.maxLevel - draggingNode.level) + 1
      console.log("深度：", deep)

      //   this.maxLevel
      if (type == "inner") {
        // console.log(
        //   `this.maxLevel：${this.maxLevel}；draggingNode.data.catLevel：${draggingNode.data.catLevel}；dropNode.level：${dropNode.level}`
        // );
        return deep + dropNode.level <= 3
      } else {
        return deep + dropNode.parent.level <= 3
      }
    },
    countNodeLevel (node) {
      //找到所有子节点，求出最大深度
      if (node.childNodes != null && node.childNodes.length > 0) {
        for (let i = 0; i < node.childNodes.length; i++) {
          if (node.childNodes[i].level > this.maxLevel) {
            this.maxLevel = node.childNodes[i].level
          }
          this.countNodeLevel(node.childNodes[i])
        }
      }
    },
  },
  created: function () {
    this.getCategory()
  }
};
</script>

<style lang="scss" scoped>
</style>
